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Browneite, MnS, a new sphalerite-group mineral from the Zakłodzie meteorite
-
Chi Ma
,
John R. Beckett
Published/Copyright:
April 2, 2015
Abstract
Browneite (IMA 2012-008), MnS, is a new member of the sphalerite group, discovered in Zakłodzie, an ungrouped enstatite-rich achondrite. The type material occurs as one single crystal (-16 μm in size) in contact with and surrounded by plagioclase; enstatite and troilite are nearby. Low-Ni iron, martensitic iron, tridymite, quartz, cristobalite, sinoite, schreibersite, buseckite, keilite, and graphite, are also present in the type sample. Browneite is yellowish brown and translucent. The mean chemical composition, as determined by electron microprobe analysis of the type material, is (wt%) S 36.46, Mn 62.31, Fe 0.62, Ca 0.10, sum 99.49, leading to an empirical formula calculated on the basis of 2 atoms of (Mn0.993Fe0.010Ca0.002)S0.995. Electron back-scatter diffraction patterns of browneite are a good match to that of synthetic β-MnS with the F4̅3m structure, showing a = 5.601 Å, V = 175.71 Å3, and Z = 4. Browneite is a low-temperature (<200 °C) phase, metastable relative to alabandite, that postdates the impact melting and subsequent crystallization of an enstatite-rich rock.
Keywords : Browneite; MnS; new mineral; sphalerite group; EBSD; Zakłodzie meteorite; enstatite achondrite
Received: 2012-7-7
Accepted: 2012-7-25
Published Online: 2015-4-2
Published in Print: 2012-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Browneite;
MnS;
new mineral;
sphalerite group;
EBSD;
Zakłodzie meteorite;
enstatite achondrite
Articles in the same Issue
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- Blue spinel crystals in the MgAl2O4-CoAl2O4 series: Part I. Flux growth and chemical characterization
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